Fredrick hildebrandt



YNTTED STATES PATENT OFFICE.

FREDRICK HILDEBRANDT, 0F NEW YORK, N. Y.

STOVE-PIPE ELBOW.

SPECIFICATION forming part of Letters Patent No. 244,720, dated July 19,1881.

Application filed October 18,1880. (Nomodel.) l

the four-piece'stove-elbows, by which a neater,l

more durable, and stronger elbow is obtained.

The fourpiece elbows heretofore manufactured were made of two differentgradesthe first grade having all the con nectingrivets of the fourpieces or sections on the inside, so as to be out ot' sight, while thesecond or cheaper grade has the rivets on the outside. They aremanufactured by cutting two sets of blanks from two sheets of sheetmetal and using onelialf of the blanks obtained thereby for one gradeand the other halt' for the other grade of elbows. Each middle piece ofthese elbows was provided at one end with an outwardlybent flange orlipv and at the other end with an annular bead, w hile the end sectionshad respectively ahead and a lip at their inner edges, which connectedwith the lip of one of the middle sections and with the bead of theother ln putting the sections to middle section. gether there is alwaysconsiderable delay in springing the tongues or lips of one section intothe connecting-beads of the adjoining section. Another objection wasthat in closing the beads over the lips by the bead-closin g machine abad and faulty joint was obtained, which rendered the article unsightlyand objectionable.

The object of this invention is to furnish a four or more piece elbow,which is quickly put together and uniformly connected without any tlawor defect; and the invention consists of providing one middle section ofthe elbow7 with lips or tongues at both ends, and the second middlesection with annular beads at both ends, and making the end sections, asbefore, with lip and bead respectively.

It consists, secondly, of making the blanks of the outerand middlesections,provided with annular beads at their ends, of slightly greaterwidth than the outer and middle sections having end lips, thelattersections being riveted closer to decrease slightly their diameter, sothat an easier insertion of the pieces or sec- Similar letters ofreference indicate corre-V spondin g parts.

In manufactu rin g in y elbows I prefer to make them also in two gradesby cutting the blanks,

as heretofore, from two pieces Vof sheet metal, and using one-halt ofthe blanks so obtained for the first grade, in which the rivets areplaced at the inside of the elbow, while the remaining blanks are usedfor the second grade,

.in which the rivets are arranged at the outside of the elbow. Themiddle sections of the first grade are preferably slightly bulged attheir outer circumference, by which the elbow receives a more roundedand better appearance. The blanks of the first grade are marked in Romanfigures I to IV, and the blanks of the second grade in Arabic figures 1to 4 in Figs. 1- and 2 of the drawings. In making up the blanks care hasto be taken that the blanks I and II of the first sheet are made ofslightly greater width than' the blanks III and IV of the second sheet,the blankrI being then bead- 'ed at the inner edge, while blank IIisbeaded at both ends. The remaining blanks III and IV are bent up withlips or tongues, and are riveted at their edges in such a manner thattheir diameter is slightly less than the diameter of the sections I andII.

By making one-half the blank-s of slightly greater width than the otherhalt' and reducing the' diameter of the latter, as described, thesections or pieces are joined without diflculty by simply throwing oneinto the other, so that no time is lost in springing one section into'the adjoining sections, as has been formerly the case.

By means of the slightly greater width of one-halt' of the blanks thereis also secured a better overlapping of the beads over the lips whenconnecting the sections'in the bead-closing machine. In this mannerconsiderable time and labor are savedin making the elbows.

IOO

Having thus described my invention', I claim as new and desire to secureby Letters Patent- A four or more piece stove-pipe elbow, in which theinner edge of one of the end sec- 5 tions und both edges of one of themiddle seetions are provided with annular beads and made of slightlygreater width and diameter than the'seeond middle and opposite endseetion, which are provided respectively at both 1o ends and at theinner end with outwardly-bent lips or tongues, all substantially as andfor the purpose set forth.

In testimony that I claim the foregoing as my invention I have signed myname in presence of two witnesses this 13th day of Octo- 15 ber, 1880.

FREDRIGK HILDEBRANDT. lWitnesses:

PAUL GOEPEL, CARL KARP.

